If libcore wants ASCII casing, it needs to ask for it like everyone else.

http://elliotth.blogspot.com/2012/01/beware-convenience-methods.html

Bug: https://code.google.com/p/android/issues/detail?id=58359
Change-Id: I597b2ac940f17b5b2bc176e390dc4b63fe0a4e72

Conflicts:
	harmony-tests/src/test/java/org/apache/harmony/nio_char/tests/java/nio/charset/CharsetTest.java